Question

A student lifts a 1.2 kg bag from her desk, which is 0.59 m high, to a locker that is 2.9 m high. What is the gravitational potential energy of the bag relative to the desk?

PE=mgh
1.2(9.80)(2.9)
= 34.1

Answer 1

PE=mgh
=(1.2)(9.8)(2.9-.59)
= 27.17J

Answer 2

A student lifts a 4.7-kg box from the her desk, which is 0.9-m high, to a locker that is 4.1-m high. What is the bags energy relative to the desk?